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Used Western Digital 4TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD4003FFBX - Walmart.com
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Refurbished: HGST Red Pro WD4003FFBX 4 TB 3.5" Internal Hard Drive - SATA - 7200rpm - 256 MB Buffer - Newegg.com
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Western Digital Red Pro WD4003FFBX 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method
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